JP2000199779A - Control method of test hand, recording medium and instrumentation and control system thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a control method capable of confirming whether or not the pressure of test hand of handler, operation speed and displacement are proper according to the kinds of an IC a socket and correcting in improper cases, a recording medium and a instrumentation and control system. SOLUTION: An instrumentation and control system is constituted of a load sensor 9 detecting the pressure P to IC 5 in a test hand 1, an acceleration sensor 10 detecting the operation speed or the acceleration A of the hand 1, a displacement sensor 11 detecting the forcing displacement D from the contacting of the hand 1 to the IC until stopping, and a control means 14 calculating a composite spring constant K of the IC and the socket 2 based on the data from each sensor, monitoring whether or not the shock operating on the IC is lower than a tolerable value Pa and which is such a pressure that the speed and displacement make the operation speed of the hand the highest and controlling the drive of the hand 1 based on each data.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a recording medium for appropriately controlling the operation of a test hand for pressing an IC device (hereinafter referred to as an IC) on a socket in an IC handler according to the type of the IC and the socket. And a measurement control system using the same.

[0002]

2. Description of the Related Art An IC handler presses an IC sent from a loader to a socket of a measuring section with a pusher of a test hand to contact an IC lead with a contactor of the socket. Then, it is a device that sorts and accommodates ICs with an unloader. However, recently, the types of ICs to be inspected and the types of sockets corresponding to the ICs have been diversified, and it is necessary to change the operation characteristics of the test hand according to the types. It is desirable for the handler to process the IC as fast as possible, but the higher the speed, the greater the impact on the IC, and
There is a disadvantage that the life of the C lead and the socket contactor is reduced.

As a solution to this problem, Japanese Patent Application Laid-Open No. 9-8998 discloses
In the handler of No. 3, the appropriate contact pressure of various ICs is input to the FD in advance, and when the operator specifies the type of the IC, the CPU sends a signal to the control valve based on data from the FD to drive the hand. The cylinder pressure to be adjusted is adjusted. Japanese Patent Application Laid-Open No. Hei 10-227834 discloses a mechanism capable of finely adjusting an appropriate pressing force, speed, and IC pushing displacement according to an IC type when a test hand is driven by a pulse motor.

[0004]

However, in each of the above-mentioned conventional products, it is necessary to input data for each IC type to a computer in advance, and that data is also displayed on a single IC pin. It depends on empirical values based on pressure, number of pins, and allowable displacement of socket contactors.

However, in an actual handler, since the test hand presses the IC with the IC inserted into the socket, there is no guarantee that the value according to the specified data is always appropriate. For example, if the speed of the hand is increased to process the IC at high speed, the impact on the IC package may be increased more than expected, or the elasticity of the IC lead or the socket contactor may be exceeded.

The present invention has been made in view of such circumstances, and a purpose thereof is to provide a control method and a control method capable of appropriately controlling the pressing force, operating speed, and displacement of a test hand according to the type of an IC and a socket. An object of the present invention is to provide a measurement control system.

[0007]

According to a first aspect of the present invention, there is provided a method of controlling a test hand for pressing an IC sent to a socket of an IC handler, the method comprising: Is pressed several times to detect the load P, the acceleration A or the speed V, and the pushing displacement amount D of the IC using each sensor. Then, the combined spring constant K of the IC and the socket is obtained from each detection data, The operation of the hand is determined so that the impact force is equal to or less than the allowable value Pa. In the recording medium of the second aspect, each data of the proper pressing force, speed and displacement of the test hand determined by the control method of the first aspect is recorded.

According to a third aspect of the present invention, there is provided a measurement control system, comprising: a load sensor for detecting a pressing force P of the test hand against the IC; an acceleration sensor for detecting an operation speed or acceleration A of the hand; A displacement sensor that detects the amount of pushing displacement D from when it is stopped until it stops.
The combined spring constant K of the IC and the socket is obtained based on the data from each sensor, and the impact force acting on the IC is set to an allowable value
a that is less than or equal to a and at which the hand moves fastest,
Control means for monitoring the speed and displacement and controlling the driving of the hand based on each data.

[0009]

FIG. 1 is a schematic diagram of a test hand 1 and a socket 2 and a block diagram of a measurement control system. Test hand 1 is IC5 with pusher 8 at the lower end.
The contactor 4 is moved up and down by the pulse motor 3 while adsorbing the contactor and is in contact with the IC lead in the IC receiving portion of the socket 2 below. Also, test hand 1
By controlling the number of rotations and the rotation speed of the pulse motor 3, the pressing force on the IC and the socket 2, the operating speed and the amount of displacement of the IC can be adjusted, and immediately before the contact with the socket 2 as described later. The speed is reduced, and the impact on the IC and the socket 2 is reduced.

The measurement control system of the present invention comprises a load sensor 9, an acceleration sensor 10, a displacement sensor 11, an amplifier 12,
A / D converter 13, computer 14, arithmetic circuit 15,
It comprises a D / A converter 16 and a drive circuit 17.

The load sensor 9 detects the pressing force of the hand 1 against the IC and the socket 2. In this embodiment, a strain gauge type load converter (load cell) is mounted above the pusher 8. The acceleration sensor 10 mainly detects a change in acceleration or speed when the hand 1 descends, and a strain gauge type or a piezoelectric type is used. A speed sensor may be used instead of the acceleration sensor. Displacement sensor 11
Detects the amount of displacement from the position immediately before the IC 5 attracted by the pusher 8 contacts the contactor 4 of the socket 2 until the IC 5 is pushed in and stopped after the contact. In this embodiment, the eddy current type non-contact displacement Meter is used.

An amplifier 12 amplifies and outputs a minute electric signal from each of the sensors 9 to 11, and an A / D converter 13 digitizes the amplified analog signal and converts the signal into a computer 14.
Send to The CPU of the computer 14 processes the detected data and the data stored in the memory M in the arithmetic circuit 15 in accordance with the setting program, and issues a command so that the hand 1 operates optimally according to the type of the IC and the socket 2. Can monitor the screen sequentially. D / A
The converter 16 converts a digital signal from the CPU into an analog signal, and the drive circuit 17 sends a drive signal to the pulse motor 3.

The CPU uses the data from the sensors 9 to 11 to determine the appropriate pressing force, impact force, operating speed and pushing displacement of the test hand 1 as follows.

Assuming that the spring constant of the pressing force IC lead is K1 and the spring constant of the socket 2 is K2, the IC and the socket 2
Is obtained by the following equation: K = (K1 + K2) / K1 · K2. The value of K is given by K = P / δ based on the pressing load P measured by the load sensor 9 and the amount δ of the IC pushing by the displacement sensor 11. At this time, the pushing displacement amount δ of the pusher 8
Is the sum (δ = δ1 + δ2) of the shrinkage amount δ1 of the IC lead and the displacement amount δ2 of the socket 2 (mainly the contactor 4). The magnitude of δ1, δ2 is determined by the respective spring constants K1,
Determined by K2.

The impact generated when the impact force IC comes into contact with the contactor 4 is determined by the amount of change in the descending speed (ΔV = V1−V0) at the time Δt immediately before and immediately after the contact. Here, the impact force F is given by F = mｍ (△ V / △ t). As can be seen from the above equation, if the descending speed V0 of the pusher 8 before contact is sufficiently reduced with respect to the operating speed V of the hand 1, and if a constant speed is maintained before and after contact with the IC, the Impact force is extremely small or zero. Here, △ V / △ t is an acceleration, which can be detected by using the acceleration sensor 10. On the other hand, the reaction force generated by the contact between the IC and the socket contactor 4 is equal to the pressing force applied to the IC by the pusher 8. This pressing force is detected by a load sensor 9 (load cell) installed above the pusher 8. Further, assuming that the mass of the pusher 8 at the tip of the test hand is m, the impact force F can be obtained from the above equation as the product of m and acceleration.

The operating speed V of the test hand 1 in the operation speed arbitrary time t (t) is the acceleration data A by displacement data D (t) or sensor 10 by the sensor 11
It can be obtained as follows using (t). V (t) = {D (t) −D (t−Δt)} / Δt V (t) = V (t−Δt) + A (t) · Δt

Indentation displacement Indentation displacement δ (t)
Is obtained from the data D (t) by the displacement sensor 11 by the following equation. δ (t) = D (t) −D (t−Δt)

On the other hand, in the memory M of the computer 14,
The following data is input in advance. (1) The operating speed V of the test hand 1 (the driving rotational speed and the rotational speed of the PM 3) (2) The braking position HB and the stopping position HS of the hand 1 (FIG. 1)
(3) Lowering speed V0 after braking (drive speed and rotation speed of PM3) (4) Allowable pushing displacement δa (displacement from contact with IC to stop) (5) Allowable pressing force Pa (Determined from δ and the composite spring constant K)

Next, a data processing process and a calculation process by the CPU will be described with reference to a flowchart of FIG. First, the IC is pressed a plurality of times on the contactor 4 of the socket by the pusher 8 of the hand to measure the load P and the displacement D, and the combined spring constant K of the IC and the socket is calculated based on the above equation (S
0). The pressing force in this case is set in the range displayed on the IC or the socket, and the pressing is performed a plurality of times in order to reduce errors and obtain accurate data.

When the pusher 8 reaches the braking position HB, the speed is reduced to V0 by a command from the computer 14, so that the operating speed V of the hand 1 is obtained using the displacement data (S5) and the acceleration data (S4). S7, S8), it is confirmed whether or not it matches V0 set in the memory M. Steps S9 and S10 are steps for checking whether the hand 1 is operating as set (normal). If the hand 1 is normal, the process proceeds to the next step. If V does not match V0, the braking position H is set.
B is changed (S11), and the process returns to step S2.

Next, the contact pressure (impact force) P (t) with the IC
Is directly obtained by the load sensor 9 (S3), or is calculated from the mass m of the pusher 8 and the acceleration A (t) (S6), and this load is compared with the allowable pressing force Pa in the memory M (S1).
3). If P (t) ≦ Pa, that is, if the impact force is within the allowable value, proceed to the next step. If P (t) is greater than Pa, change the rotation speed or rotation speed of the pulse motor 3 (S
14) Return to step S2 again.

In step S15, the pushing displacement D (t) of the IC is compared with an allowable value δa in the memory M, and
If (t) exceeds the δa value, Hs (hand stop position)
Is changed (S16), and the process returns to step S2. Hs may be changed by changing the stroke of the hand 1, that is, the rotation speed of the pulse motor 3.

In step S10, the quality of the hand operation and the discrimination in steps S13 and S15 can be confirmed by the operator on the monitor. Therefore, if the initial set value is appropriate, it is used as it is, and if it is inappropriate, it is correctly corrected. You. In addition, the operation speed V of the hand 1 is within a range that satisfies steps S13 and S15.
Is large, the IC processing capacity of the test hand can be maximized, and the speed is reduced to V0 immediately before the hand 1 descends. Therefore, even if V is slightly increased, the impact is considerably suppressed.

[0024]

As described above, by incorporating the control method and the measurement control system of the present invention into the handler, the test hand can be properly operated in a short time even for different types of ICs and sockets. In addition, once the data obtained by the system of the present invention is once recorded on a recording medium such as a floppy disk, and input to an existing handler to operate the test hand, the same effect can be obtained without directly incorporating the present system. Can be

[Brief description of the drawings]

FIG. 1 is a block diagram of a test hand measurement control system.

FIG. 2 is a flowchart of a computer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Test hand 2 Socket 3 Pulse motor 4 Contactor 5 IC device 6 Target for displacement sensor 7 Mounting arm 8 Pusher 9 Load sensor 10 Acceleration sensor 11 Displacement sensor 12 Amplifier 13 A / D converter 14 Computer 15 Arithmetic circuit 16 D / A conversion Unit 17 Drive circuit M Memory HB Hand braking position Hs Hand stopping position δa Allowable displacement K Composite spring constant

Claims (3)

[Claims] 1. A control method of a test hand 1 for pressing an IC sent to a socket 2 of an IC handler. First, the hand 1 presses an IC 5 on the socket 2 a plurality of times, and the load P, acceleration A or The speed V and the displacement amount D of the pushing of the IC are detected by using the respective sensors. Then, the combined spring constant K of the IC and the socket 2 is obtained from the respective detection data. Control method that determines the operation of 2. A recording medium in which data of an appropriate pressing force, speed and displacement of the test hand determined by the control method according to claim 1 is recorded. 3. The pressing force P of the test hand 1 against the IC5.
, A load sensor 9 for detecting the operating speed or acceleration A of the hand 1, a displacement sensor 11 for detecting a push-in displacement D from when the hand 1 comes into contact with the IC until it stops. The combined spring constant K of the IC and the socket 2 is determined based on the data from each sensor. Monitor whether the hand 1 based on each data
And control means 14 for controlling the driving of the test hand.